Johannsenite
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| Johannsenite[1] | |
|---|---|
 | |
| General | |
| Category | Mineral |
| Formula (repeating unit) | CaMn2+Si2O6 |
| IMA symbol | Jhn[2] |
| Crystal system | Monoclinic |
| Identification | |
| Color | blue-green, grey-white, dark brown, colourless |
| Mohs scale hardness | 6 |
| Streak | white |
Johannsenite is a silicate mineral that is a member of the pyroxene family. The mineral can be produced in limestone or due a metamorphic process.[3] The mineral is also associated with Pb-Zn mineralization.[4]
It is a relatively rare material.[5] but is said to be abundant in the Aravaipa region of Arizona.[6] It is commonly found as a spherulite like aggregate.[7]
The mineral is vulnerable to oxidation, hydration, and carbonation. It is also commonly altered to rhodonite.[8]
The mineral was named in 1932 after Albert Johannsen.[9]
Occurrence
[edit]It can be found in countries like Mexico, Italy, Australia,[5] the United States, Australia, and Japan.[3]
Johannsenite can be found in limestone affected by the element magnesium during metamorphosis. It is also found in veins.[5]
References
[edit]- ^ "Johannsenite".
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ a b "Johannsenite | mineral". Encyclopedia Britannica. Retrieved 2021-09-02.
- ^ Mao, Jingwen; Bierlein, Frank P. (2008-01-08). Mineral Deposit Research: Meeting the Global Challenge: Proceedings of the Eighth Biennial SGA Meeting, Beijing, China, 18 - 21 August 2005. Springer Science & Business Media. p. 507. ISBN 978-3-540-27946-4.
- ^ a b c Sorrell, Charles A. (2001-04-14). Rocks and Minerals: A Guide to Field Identification. Macmillan. p. 178. ISBN 978-1-58238-124-4.
- ^ Geological Survey Professional Paper. U.S. Government Printing Office. 1964. p. 123.
- ^ Skinner, H. Catherine W.; Skinner, Lecturer in Surgery and Associate Professor of Biochemistry H. Catherine W.; Ross, Malcolm; Frondel, Clifford (1988). Asbestos and Other Fibrous Materials: Mineralogy, Crystal Chemistry, and Health Effects. Oxford University Press. p. 50. ISBN 978-0-19-503967-2.
- ^ Deer, William Alexander; Howie, Robert Andrew; Zussman, J. (1997). Rock-Forming Minerals: Single-chain Silicates, Volume 2A. Geological Society of London. p. 417. ISBN 978-1-897799-85-7.
- ^ "Johannsenite". www.mindat.org. Retrieved 2021-09-02.